GAIL (India) Limited

143.6.3 WATERWater used in the works shall be potable water and free from deleterious materials. Water used for mixingand curing concrete as well as for cooling and/or washing aggregate shall be fresh and clean, free frominjurious amounts of oil, salts, acids, alkali, other chemicals and organic matter.Water shall be from the source approved by the Consultant / Engineer-in-charge and shall be inaccordance with Clause 4.3 of IS: 456.Before starting any concreting work and whenever the source of water changes, the water shall be testedfor its chemical and other impurities to ascertain its suitability for use in concrete for approval of theConsultant. No water shall be used until tested and found satisfactory. Cost of all such tests shall be borneby the contractor.3.6.4 ADMIXTURES AND ADDITIVESChemical admixtures are not to be used until permitted by the Consultant/Engineer-in-charge in case theiruse is permitted, the type, amount and method of use of any admixture proposed by the contractor shall besubmitted to the Consultant for approvalThe contractor shall further provide the following information concerning each admixture to theConsultant/Engineer-in-charge.a) Normal dosage and detrimental effects, if any, of under dosage and over dosage.b) The chemical names of the main ingredients in the admixture.c) The chloride ion content, if any, expressed as a percentage by weight of admixture.d) Whether or not the admixture leads to the entertainment of air when used in the manufacturer’srecommended dosage.e) Where two or more admixtures are proposed to be used in any one mix, the manufacturer’swritten confirmation of their compatibility.In reinforced concrete, the chloride ion of any admixture as determined in accordance with IS: 6925 andthe total chloride ion in all admixtures used in concrete mix shall not exceed 0.30n percent by weight ofcement.The admixtures when used shall conform to IS: 9103. The suitability of all admixtures shall be verified bytrial mixes.The addition of calcium chloride to concrete containing embedded metal will not be permitted under anycircumstances.Regarding admixtures when used shall be based on lingo-sulphonates with due consideration to clause 5.2and 5.30 of IS: 7861.3.7 PLANTWaterproofing admixtures shall comply with IS: 2645.The contractor shall obtain the approval of the Consultant/Engineer-in-charge for all plant items heproposes to use for the manufacture and placing of concrete.The arrangement shall maintain all items of plant at all times in a clean and efficient working condition.3.8 STORAGEAll goods and products covered by these specifications shall be procured well in advance and stored asspecified below.3.8.1 CEMENTCement shall be stored on a raised floor in dry weather proof & dust free but well ventilated shed.